I'm sorry that you're being treated this way, and to be honest I'm a little bit stunned by some (ok most) of his responses.

Starting therapy might be exactly the right thing to "prove" to him that there is a legitimate issue. I know that paranoia feeling very well and it's an absolutely terrible feeling to feel it at ALL and it's even worse to get made fun of for it.

One of my pet peeves is becoming when people refer to those without any mental illness as being "normal". That just... grinds my gears... grates my corn... steams my clams... whatever phrase you wish to use. Because in NO way is it "normal" to put down someone like that, much less a spouse. I'm so sorry that you're being treated like that.